What is a induced draft fan?
An induced draught fan (ID fan) is provided to maintain a negative pressure in the furnace by sucking the products of combustion from it with a slight positive pressure at the discharge end vis-à-vis the bottom of the chimney/stack.
Why FD fan is used in boiler?
Forced Draft Fans (FD) supply the air necessary for fuel combustion by pushing air through the combustion air supply system and into furnace. These fans are located at the inlet of boiler to push high pressure fresh air into combustion chamber, where it mixes with the fuel to produce positive pressure.
What is an induced draft blower and what is it used for?
Applications. Fans that are used to evacuate a space or create negative air pressure in a system are referred to as induced draft fans. Occasionally, manufacturing spaces are required by specifications to be maintained at a specific negative pressure.
Where is the induced draft fan located?
Induced draft fan is normally located at the outlet between dust collector and chimney. The fan takes hot flue gases from the boiler through dust collector and delivers it to the chimney into the open atmosphere.
What is the difference between forced draft fan and induced draft fan?
Forced-draft fans focus the pressure and volume at the outlet of the fan to push air through a system, creating positive air pressure. Industrial induced draft fans operate by focusing the pressure and volume at the inlet of the fan to pull air through a system.
What is the use of induced draft fan?
Induced draft fans or ID fans are used in systems such as steam boilers and thermal oil heaters to draw out and remove flue gases from combustion chambers, by creating a vacuum of negative air pressure (typically -10 mm Hg).
What is FD fan in boiler?
A forced-draft (FD) fan is a type of pressurized fan that gives off positive pressure within a system. It is mainly used in industries that employ boiler systems in order to promote boiler efficiency, but it has a wide range of applications.
What is the function of ID fan in boiler?
Why is induced Draught considered better than forced Draught?
The forced draught overcomes the resistance of the fuel bed there fore sufficient air is supplied to the fuel bed for proper and complete combustion. The induced draught fan removes the gases from the furnace maintaining the pressure in the furnace just below atmosphere.
How does a forced draft fan work?
What is the difference between induced and forced draft?
Induced draft implies an inlet fan placed on top of the cooling tower and the creation of low pressure. Axial fans are always used for this type of draft. Forced draft means an exhaust fan placed at the base of the cooling tower which then causes overpressure. Both axial and centrifugal fans can be used.
What problems occur with induced draft fans?
If the inducer fan motor cannot turn on, the furnace will generally shut off and lock out. Other reasons why the draft inducer blower may ultimately shut down a furnace include a faulty pressure switch, a bad rubber tube component, or there may be a blockage in the gas vent flue, or even that the blower itself may not be working properly.
What is the working principle of induced draft fan?
Working Principle: Induced draft fan is also used to identify the combustion process used in large boilers. When mechanical ventilation is supplied to these boilers, the heat transfer rate increases. Induced draft fan or induced draft fans is always located between dust collector and chimney.
What is induced draft fan?
Induced Draft Fan: Induced Draft Fan or ID fan is used to create a vacuum or negative pressure in a system like Steam boiler or Thermal Oil Heater. Working Principle: Induced draft Fan is also used to identify the combustion process used in large boilers.
What does an inducer fan do on a furnace?
A draft inducer is a fan that’s located inside of your furnace near the heat exchanger. When your furnace begins a heating cycle, the draft inducer is one of the first devices that turns on. In fact, the draft inducer starts up 30-60 seconds before the burners are lit and continues to run throughout each heating cycle.